yum install mariadb mariadb-server #询问是否要安装，输入Y即可自动安装

[root@127 ~]# systemctl start mariadb.service #启动MariaDB[root@127 ~]# systemctl stop mariadb.service #停止MariaDB[root@127 ~]# systemctl restart mariadb.service #重启MariaDB[root@127 ~]# systemctl enable mariadb.service #设置开机自动启动

[root@127 ~]# systemctl disenable mariadb.service #设置开机自启关闭

[root@127 ~]# mysql_secure_installation  #为初始化账户root添加密码NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!In order to log into MariaDB to secure it, we‘ll need the currentpassword for the root user.  If you‘ve just installed MariaDB, andyou haven‘t set the root password yet, the password will be blank,so you should just press enter here.Enter current password for root (enter for none):这里填写root密码，如果是第一次初始化密码为空直接敲回车（回车前）

Enter current password for root (enter for none):这里填写root密码，如果是第一次初始化密码为空直接敲回车 （回车后↓）OK, successfully used password, moving on...Setting the root password ensures that nobody can log into the MariaDBroot user without the proper authorisation.You already have a root password set, so you can safely answer ‘n‘.Change the root password? [Y/n] yNew password: 这里填写新的密码Re-enter new password: 这里填写重复的密码Password updated successfully!Reloading privilege tables.. ... Success!By default, a MariaDB installation has an anonymous user, allowing anyoneto log into MariaDB without having to have a user account created forthem.  This is intended only for testing, and to make the installationgo a bit smoother.  You should remove them before moving into aproduction environment.Remove anonymous users? [Y/n] y ... Success!Normally, root should only be allowed to connect from ‘localhost‘.  Thisensures that someone cannot guess at the root password from the network.Disallow root login remotely? [Y/n] y ... Success!By default, MariaDB comes with a database named ‘test‘ that anyone canaccess.  This is also intended only for testing, and should be removedbefore moving into a production environment.Remove test database and access to it? [Y/n] y - Dropping test database...ERROR 1008 (HY000) at line 1: Can‘t drop database ‘test‘; database doesn‘t exist ... Failed!  Not critical, keep moving... - Removing privileges on test database... ... Success!Reloading the privilege tables will ensure that all changes made so farwill take effect immediately.Reload privilege tables now? [Y/n] y ... Success!Cleaning up...All done!  If you‘ve completed all of the above steps, your MariaDBinstallation should now be secure.Thanks for using MariaDB!
# 这里表示修改密码成功

[root@127 ~]# mysql -uroot -proot 

　　　　　　　#　mysql -u这里是填写的用户名（默认为root） &我是空格& -p这里填写的是密码（默认为空）

这表示已经进入MariaDB
Welcome to the MariaDB monitor.  Commands end with ; or \g.Your MariaDB connection id is 23Server version: 5.5.50-MariaDB MariaDB ServerCopyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.# 通过/h可以查看很多命令MariaDB [(none)]> 这里是输入sql语句的入口